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Message: <blockquote data-quote="EFN" data-source="post: 252384" data-attributes="member: 1416">Hey Abel,No harm in asking.Performance is quite subjective to how you tune them.I cannot give guarantee any performance increase simply to spice up the item/services that I sell.Well look at it this way. With an adjustable FPR unit, now you can tune your EFi fuelling behavior to a certain degree that it is similiar to tuning a carburetor. As we know for EFi, fuel are almost 100% managed by ECU and most of us don't want to mess with the ECU - so the other way round we can tune Fuel feed is by increasing or decreasing the Fuel Pressure injected. Normally for NA tuning, an increase of 1 to 2 PSI is enough to add grunts to Throttle Response and Acceleration, or if the car is already running rich mixture, leaning it out a bit will do significant difference.Bottomline is, with OEM FPR you don't have the choice to run the Fuel Pressure you want, so make it adjustable so that it can be tuned to suit your need.I can share you my past experience with AFPR. First I will have to know what are the normal OEM Pressure Level for my engine. Then I start with decreasing the pressure and do a test drive for a day or two. Then, if the engine seemed to be having "flat spot" on acceleration, I will bump it up another PSI and test again. i will keep adding pressure by 1 PSI increment until I can almost smell fuel from the exhaust. So start decreasing the pressure again to get the best setup between the ones that have been done before. Remember, more fuel does not necessarily means more power - in fact an overly rich mixture will make RPM slow and flat spot at high RPM. Finally memorizing all the setup that I have done before, I went for Dyno reading to see if my "feel" tuning is correct. From Dyno results I know now at which PSI is the optimum range for my car. Without A-FPR, all this is not possible.TQ for reading.</blockquote>

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